The Best Astronomy and Space Photos of 2013

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It's the most wonderful time of the year: When I spend days and days laboring over thousands of space and astronomy photos, agonizing over which ones to include in my annual list of the best of the year.

Let me add that the pictures are beautiful, sure, but I didn't choose them necessarily for their beauty; I also picked ones that are important, thought-provoking, or show something in an unusual way. I guarantee they'll delight your eyes and tickle your brain. And isn't that why we explore space in the first place?*